Support explicit placement of the temporary-table schema
within search_path, and disable
searching it for functions and operators (Tom)

This is needed to allow a security-definer function to
set a truly secure value of search_path. Without it, an unprivileged SQL
user can use temporary objects to execute code with the
privileges of the security-definer function
(CVE-2007-2138). See CREATE
FUNCTION for more information.

/contrib/tsearch2 crash fixes
(Teodor)

Require COMMIT PREPARED to be
executed in the same database as the transaction was
prepared in (Heikki)

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